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  <script>
    const obj = {
      uname: 'pink'
    }
    function fn(x, y) {
      console.log(this) // window
      console.log(x + y)
    }
    // 1. 调用函数  
    // 2. 改变 this 指向
    fn.call(obj, 1, 2)
  </script>
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